Stainless Steel 347 Fasteners Quick Facts
Mortec At A Glance
Established
Since 2012 • 15+ yrs experience
Manufacturing Units
2 in-house units • Taloja & Mazgaon
Stockyard Area
8,850+ sq.ft • Ready-stock inventory
Certifications
ISO 9001:2015 • GST, IEC & MSME
Clientele
100+ clients • India & export markets
Export Reach
15+ countries • Africa, GCC & Americas
Testing Offered
Mechanical, chemical & intergranular • MTC EN 10204 3.1 & 3.2
Shipment Documents
Invoice, Packing List • COO, COI, MTC, BL & Lab Report
Table of Content
Niobium-Stabilized SS 347H Hex Bolts and Nut Manufacturer in India For Turbines & Superheater Lines
Turbine casings and superheater headers require extensive welding across multiple joint passes. Every weld pass creates another opportunity for ordinary bolts. These bolts can sensitise along fusion lines during repeated welding cycles. That's why Gulf, South Africa and Canada plant buyers specify SS 347 bolts. Niobium stabilisation locks carbon before chromium, maintaining weld-safe fastener performance. This remains effective through repeated post-weld heat treatment cycles. Our ex-stock hex bolts, studs, nuts and washers ship quickly. Most orders stay moving within days rather than several weeks.
Every SS 347H fastener carries complete mill test certification documentation. Intergranular corrosion testing is available upon request for demanding applications. Packing is rated for long ocean transit and export handling. As direct-from-forge Stainless Steel 347 fastener suppliers, we eliminate trading layers. This means sharper pricing and faster technical answers for buyers. Send thread size, condition and quantity for availability confirmation. Our grade desk confirms availability before you commit to orders.
Stainless Steel 347 Fasteners Specification
Send us your diameter, thread class and order quantity for an instant ex-Mumbai price on SS 347 fasteners with MTC.
UNS S34700 Studs Head & Drive Styles
- Hex head, socket head, button head
- Countersunk & continuous-thread rod
WNR 1.4550 Bolts Surface Finish
- Bright, passivated, self-colour
- Electropolished finish on request
SS 347 Nuts Testing & Documentation
- PMI, proof load, tensile & hardness
- MTC, third-party inspection on request
SS 347 Screws Sensitization Resistance
- Resists carbide precipitation 425–870°C
- ASTM A262 practice available on request
UNS S34700 Fastener Manufacturing Origin
- Hot forged, cold headed or CNC machined
- Indian & European mill sourced bar
SS 347 Bolts Export Packing
- Seaworthy crating & VCI wrapping
- FOB, CFR, CIF or DAP terms available
Stainless Steel 347 Fasteners Size Range
- 1/4" to 2" and M6 to M52 diameters
- Custom lengths cut as per drawing
SS 347 Hex Bolts Standards & Threads
- ASTM A193 Gr B8C / A194 Gr 8C
- ASME B18.2.1, DIN 931 / 933, ISO 4014 / 4017
347 Stainless Steel Nuts Chemistry & Grade
- 17-19% Cr, 9-13% Ni, Nb stabilised (10xC min)
- ASTM A276 / A479 bar, 347H available
Specialized in Producing High-Temp UNS S34700 Screws and Threaded Rod With IGC Test At Wholesale Pricing
SS 347 Fastener Testing & Certification
Mortec is a trusted Stainless Steel 347 Fasteners Manufacturer in Mumbai, supplying precision fasteners with complete MTC.
347 Stainless Steel Nuts Size Chart
ASTM A193 Grade B8C (UNS S34700) hex bolts to ASME B18.2.1 & B1.1 UNC standards. custom sizes available.
| Nut Size (mm) |
Diameter (mm) |
Height (mm) |
|||
|---|---|---|---|---|---|
| Jam Nut | Hex Nut | Nylock Nut | |||
| 2 | 4 | 1.2 | 1.6 | - | |
| 2.5 | 5 | 1.6 | 2 | - | |
| 3 | 5.5 | 1.8 | 2.4 | 4 | |
| 4 | 7 | 2.2 | 3.2 | 5 | |
| 5 | 8 | 2.7 | 4 | 5 | |
| 6 | 10 | 3.2 | 5 | 6 | |
| 7 | 11 | 3.5 | 5.5 | - | |
| 8 | 13 | 4 | 6.5 | 8 | |
| 10 | 17 | 5 | 8 | 10 | |
| 12 | 19 | 6 | 10 | 12 | |
| 14 | 22 | 7 | 11 | 14 | |
| 16 | 24 | 8 | 13 | 16 | |
| 18 | 27 | 9 | 15 | 18.5 | |
| 20 | 30 | 10 | 16 | 20 | |
UNS S34700 Fastener Applications
Get Stainless Steel 347 Fasteners Manufacturer in India with extensive ex-stock for turbine and process-plant bolting.
Stainless Steel 347 Fasteners Exporter in Mumbai
Send your drawing or datasheet and our desk confirms grade, class and stock the same working day.
Stainless Steel 347 Fasteners Types
Contact Stainless Steel 347 Fasteners Supplier in India, offering ex-stock inventory of bolts, studs, nuts, and washers.
SS 347 Hex Bolt
ASME B18.2.1 • 1/4″–2″- Wrench-fit head for flange joints
- Most-ordered form, held ex-stock
WNR 1.4550 Studs
Continuous & Double-End • Custom Length- Cut and threaded to your drawing
- Preferred for turbine casing bolting sets
SS 347 Socket Head Cap Screw
ISO 4762 / ASME B18.3- Allen-key drive for confined spaces
- Available cup, cone & dog point set screws
WNR 1.4550 Heavy Hex Nut
ASME B18.2.2 • 1/4″–2″- Matched thread class to your bolt lot
- Standard or jam profile in stock
SS 347 Hex Jam Nut
ASME B18.2.2 • Low-Profile- Locking second nut for vibration duty
- Common on exhaust hanger assemblies
SS 347 Flat Washer
ASME B18.21.1- Spring-load Belleville for thermal cycling
- Wide fender pattern for soft substrates
SS 347 U-Bolt
Pipe Clamp & Support Duty- Bent and threaded to your pipe OD
- Used on exhaust and duct hangers
UNS S34700 Threaded Rod
Full Thread • Custom Cut Length- Cut to length with die-cut or rolled thread
- Common in structural hanger rod duty
SS 347 Solid Rivet
Furnace & Ducting Grade- Cold-headed for consistent shear strength
- Custom diameter and grip length
SS 347 Fastener Chemical Composition
AISI 347 Threaded Rod Mechanical Properties
Stainless Steel 347 Fasteners Equivalent
UNS S34700 has regional equivalents, all sharing the same niobium-stabilised Cr-Ni chemistry.
ASTM / AMS (USA)
- UNS S34700
- ASTM A193 Grade B8C (Bolts & Studs)
- ASTM A194 Grade 8C (Nuts)
- ASTM A479 (Bar Stock)
DIN / EN (Germany)
- Werkstoff 1.4550
- EN X6CrNiNb18-10
- EN 10269
JIS (Japan)
- SUS 347
BS (United Kingdom)
- BS 347S31
- Follows EN 10269 (1.4550)
GB/T (China)
- 06Cr18Ni11Nb
UNS S34700 Screws Physical Properties
UNS S34700 screws offer high thermal stability, non-magnetic behavior in the annealed state, and a density of 8.0 g/cm³.
| Density, lb/in3 | 0.288 |
|---|---|
| Modulus of Elasticity, psi | 28.0 x 106 |
| Thermal Conductivity, Btu/ft hr ˚F | 9.2 |
| Specific Heat, Btu/lb ˚F | 0.12 |
| Electrical Resistivity, Microohm-in | 28.4 |
SS 347H Fasteners Exporter In India To Jebel Ali, UAE
Turbine and process-plant bolting lots are palletised and documented for Gulf-bound freight.
SS 347H Bolts High-Temperature & Creep-Rupture Resistance
Niobium carbides withstand higher temperatures than Grade 321, making Grade 347 ideal for turbines and superheaters.
UNS S34700 Screws Weldability & Knife-Line Attack Resistance
This is the top question buyers ask before specifying this grade for weld studs or hanger rods.
Need Mill Test Certificates With Your SS 347 Threaded Rod Order?
Each bolt lot is issued with full chemical and mechanical test records, upgradeable to 3.2 witnessed on request.
SS 347 vs SS 321 Fasteners – Which To Choose ?
Both grades are stabilised against sensitisation, but the stabilising element decides which one survives your fabrication route.
SS 347 (UNS S34700)
- Stabiliser: Niobium (columbium)
- Best For: Multi-pass welds and repeated post-weld heat treatment
- Typical Use: Turbines, superheaters, chemical process vessels
SS 321 (UNS S32100)
- Stabiliser: Titanium
- Best For: Single-pass welds in the 425–900°C range
- Typical Use: Boilers, exhausts, furnace bolting
INOX 347 Nuts Torque & Proof Load Reference
Torque is not a fixed number for a given size - it depends on thread diameter, pitch, class and friction (lubricated vs dry).
Start From Proof Load
Target preload is usually 65–75% of the bolt's proof load, itself derived from yield strength and stress area.
Apply The Torque Formula
T = K × D × F, where K is the friction (nut factor), D is nominal diameter and F is target clamp load.
Watch Galling Risk
Austenitic stainless threads gall easily - a nickel-based anti-seize is recommended on every SS 347 assembly.
Verify By Test
For critical turbine or vessel joints we recommend a calibrated torque-tension test on a sample lot before production tightening.
Give us your thread size, pitch and class, and our team returns a size-specific torque figure - Request Your Torque Chart.
ASTM A193 Grade B8C Supplier In Chennai, IGC Tested Per ASTM A262
Every heat lot supplied to your Chennai site carries independent intergranular corrosion test results.
Stainless Steel 347 Fasteners Delivery Estimate
Upon payment and drawing approval, SS 347 Nuts lots are dispatched from our Mumbai stockyard as per your preferences.
Ex-Stock Bolts, Studs & Nuts
Common sizes dispatch from our facility inside 2 working days
Sea Freight / FCL & LCL
Most economical for bulk turbine bolting sets; transit runs 12–28 days and varies by destination port
Air Freight Priority
Suited to plant shutdown windows, arriving door to door in 3–5 days
Destination-Wise ETA
Share your delivery port or city and receive a confirmed ship date
SS 347 Fastener FAQs
Quick answers to the questions buyers ask us most before placing an order.
What is type 347 Stainless Steel used for in Hex Bolts?
UNS S34700 is niobium-stabilised, preventing weld decay in turbine and superheater bolting.
Is Stainless Steel 347 better than SS 316 for Stud Bolts?
SS 316 handles chlorides; SS 347 stud bolts suit hot welded joints.
What are the differences between Stainless Steel 304 and 347 Fasteners?
Grade 304 sensitises near welds; Grade 347 adds niobium to stop carbide precipitation.
What is the equivalent grade for SS 347 Fasteners?
UNS S34700 matches DIN 1.4550, JIS SUS347 and BS 347S31.
Do you export SS 347 Bolts, Nuts and Washers to South Africa, the UAE and Kenya?
Yes - SS 347 nuts and washers ship to Durban, Jebel Ali and Mombasa with full documents.
What sizes are available in SS 347 Threaded Rods and Screws?
SS 347 threaded rods run 1/4" to 2" and M6 to M52, cut to drawing.
Which ASTM standard applies to SS 347 Bolting and 347H Fasteners?
ASTM A193 Gr B8C bolts with A194 Gr 8C nuts; 347H adds creep strength.
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